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The SGU 2-22 two seat training glider was introduced in 1945 and quickly became the most popular training glider in the USA.[4]

By the early 1960s it became obvious to Schweizer Aircraft that a replacement for the 2-22 was needed. At that time the single seat Schweizer SGS 1-26 was becoming very popular for one-design competition flying. The company realized that the new trainer should have similar performance to the 1-26, in order to be used as the 1-26's two seat transition trainer.[3]

SGU 2-22 production was ended at serial number 258 in 1967 to commence production of the new model.[3]

The SGS 2-33, indicating Schweizer Glider, Sailplane, 2 Seats, Model 33, was designed by Ernest Schweizer. The aircraft was a derivative of the 2-22, which in turn was based on the SGU 1-7 single place glider of 1937. The 2-33 retained the 2-22 and 1-7's metal wing, single spar and single strut arrangement.[1][2][5]

The 2-33 was manufactured in three variants and remained in production for 14 years. Production was only curtailed when demand dropped off due to the import of higher-performance two-place sailplanes from Europe.[3]

Each Model SGS 2-33A glider assembled from a kit is designated Model SGS-2-33AK. These K models will be eligible for an airworthiness certificate when accompanied by an affidavit certifying that the glider is constructed in exact accordance with the approved drawings and manual, and that the parts and materials furnished by the manufacturer in the kit have been used; and further when the following inspections have been satisfactorily passed:

(a) An inspection for workmanship, materials, and conformity before any covering is applied. (All woodwork may be sealed.)
(b) A final inspection of the completed glider.
(c) Check of flight characteristics.

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The 2-33 type certificate is currently held by K & L Soaring of Cayuta, New York who now provide all parts and support for the Schweizer line of sailplanes.[6][7]

The 2-33 was designed to be rugged, easy to maintain and with a high degree of crashworthiness.[1][2][3][5]

The 2-33 has a welded steel tube fuselage covered in aircraft fabric. The single-spar, aluminum structure wings are tapered from mid-span and feature top and bottom balanced divebrakes. The wings are covered in aluminum stressed skin. The tailplane and elevator are made from welded steel tube covered in aircraft fabric. The vertical fin is aluminum stressed skin construction, while the rudder is fabric-covered.[1][2][5]

The 2-33 has a fiberglass nose cone and a one-piece molded front canopy. Access to the rear seat is via door on the right-hand side. Instruments are fitted in the front cockpit only. Most 2-33s have a four-position bungee trim system, with aircraft starting with serial number 500 equipped with a "ratchet-lock trim".[1][2][5][8]

The original 2-33 was certified on 10 February 1967 and includes serial numbers 1 to 85.[1][2][6][15]

SGS 2-33A

The "A" model incorporated some minor changes, including a larger rudder with an aerodynamic balance horn. It was certified on 7 March 1968 and includes serial numbers 86 and subsequent. The replacement rudder of the "A" model was available as a retrofit to earlier 2-33s and some have been upgraded to "A" status.[1][2][6][15]

SGS 2-33AK

The "AK" model was an "A" model completed by the buyer from a kit. It was certified on 19 April 1973.[1][2][6]